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CHARLES J. SHEPARD, OF BROOKLYN, NEW YORK, Letters Patent No. 72,095, dated December 10, 1867.

TUBULAR HliiATlili TO ALL WHOM IT MAY CONCERN:

Be it known that I, CnAnLEs J. SHEPARD, of Brooklyn,- Kings county, NewYork, have invented, made, and applied to use certain-new and useful Improvements in the Construction of Tubular Heaters for HeatingAir or Water; and I do declare the following to bee. full, clear, and correct description of the same,refereuce being had to the accompanying drawings, making part of this specification, and .tothc letters of reference marked thereon, in which- Figure 1 is a sectional sideelevation of my improved tubular heater.

Figure 2, an end view of the front of the same. v

Figure 3, a top view of the grate-plate, slide-valve rest-s, and a part of the air-heating chamber.

Figure 4, a rear view of combustion-chamber and flue. I

Figure 5, a plan view of the same.

Figure 6, a view of division-plate sometimes employed by me.

In the drawings, like parts of the invention are indicated by the same letters of reference.

.The nature of the present invention consists v '(a.) In combination with the grate E, ash-pit D, and combustion-chamber C, the slide-valve I.

(21.) In the use or employment of a slide-valve at the junction of the upper and under front fines; for the purpose of providing a direct draught to the chimney and the removal of ashes from the upper flue.

(0.) In the'nse or,employment of the upper front flue, epvered externally with a non-conducting lining, as a portion of the combustion-chamber. i I

(d-) In the use or employment of the back the, and the door or doors connected therewith, forthc purpose of afl'ording ready access to the tubes for cleaning the same and for cleaning the flue at the same time.

(e.) In the use or employment of a corrugated tubular internally-flanged chamber, provided with an incombustible termination, by the employment of which the oxygen is more completely prepared by-its exposure, as more fully described.

' In the use or employment of'a semi-cylindrical reverberating chamber of combustion in combination with a fine and a series of tubes, which chamber of combustion is provided with a non-conducting reverberating m'ch, by means of which the gases are kept highly'heated in their passage, are commingled, concentrated, and

consumed prior to their passage to the tubes.

(9 In the use or employment of a feeding-chamber, in combination with an arched chamber of combustion and the abutments for properly distributing the fuel upon the grate.

' In constructing the bed-plate or grate-plate in such a'manner that the same shall form a support for the grate andbriek-work of the chamber of combustion, as well as the bed of the front flue.

In the use or employment, in combination with a series of tubes, of a division-plate, 27, for the purpose hereinafter described. r i

To enable those skilled in the arts to make and Llsfl llly invention, I will proceed to describe the construction and operation of the same. I

A and A show any number of'tubes held in or connected with the circular plates a, provided with the flanges, recesses, or collars I), which flanges, recesses, or collars project beyond. the ends of the tubes, or, if

cast tubes are used, may be merely holes in the plate, through which'thc tubes may pass, abutting against a flange on the outside of the tubes, or by any other mechanical construction. B is a cylindrical casing in which are placed the combustion-chamber C, ashpit D, grate E, supported by the grate-plate E and air-chambei- F, to supply fresh oxygen to the burning fuel. This air-chamber F is made up ,of two plates, forming, when put together, a series of air-spacesmarked e, in figs. 4 and 5 of the drawings. These air-spaces c are closedat the top, and the air entering them leaves them through the openings 31, as clearly shown in fig- 2. The backs of these airspaces form a series of cylinders or corrugations, as clearly shown in fig- 5, provided with flanges projecting into the interior of the air-spaces, and dividing each air-space into two parts; these fiangesforming'" additional surfaces for heating the air in its passagethrough the same. H shows the upper front line, and G the lower front flue of the'heater. The air-chamber F forms the front wall of the upper front flue H, while the lower front flueGr is divided from the ash-pit D by the plate 28. Within this cylindrical casing are also con:

tained the front slide or other valve I, and the rear slide or other valve J. Upon one side of this casing is th opening K for the exit of the smoke; or, if-dcsircd,a division may be placed in the back flue N, by which the current arising from combustion may be changed and taken from the back flue. At the topof this cylinder casing can be placed a feed-chamber, L, which feed-chamber may be either inclined or perpendiculaig which feed-chamber is intended to supply fuel to the grate E The chamberof combustion is lined upon its exposed surfaces with any non-oonducting material, 29, the effect of which is to cause the same to act'as a revel-berating chamber, throwing back upon the fire the heat thrown out from the same, and causing a mOlCPGIfGOl? combustion of the gases evolved in combustion. The upper flue is also lined with a non-combustible material, 29, and forms a portion of this roverberating chamber; M is the shell of the back find or flues N, throughwhich an exit for the smoke can be made when desired by a division in the flue N. This shell is provided with a door or doors, 0, thus giving free and immediate access to the tubes A and A and flue N, for the purposes of examination and cleaning the same. 1? is the front shell of the cylindrical casing B the rear portion of which forms the front section of the combustion-chamber. Attached to the front of this shell is the door-frame P for supporting the doors Q, giving access to the combustion-chamber and ash-pit, as also the door R giving access to the feeding or supply-chamber L. S is a jacket for enclosing the whole furnace, which jacket may be provided with suitable inlets and outlets for the admission and exit of air when no brick-work is used in setting the furnace in position.

' My improved'tubular heater being thus constructed, the operation may be thus described: The fuel is fed through the feed-doors to the grate, and there ignited. The heated gases arising from the fire proceed to the point (1, but before reaching that point, are met-at the point shown by the arrow by a current of fresh oxygen passing through the tubular chamber F, to .which tubular chamber said current of oxygen is admitted from the ash-pit D, at the point shown by the arrow, through openings e in the bed or grate-plate E At the point of the combustion-chamber where the fresh oxygen enters, as just desc ribed, are incombustible openings 30. The oxygen thus admitted, and the highly-heated gases, are concentrated and commingled at this point, consumed, and pass into the front flue H, whence they are supplied to the pipes A, and, having passed through these tubes, connect with the upper flue, take the course indicated by the arrows, and thence into the back tlue N, returning through the lower tubes A into-the flue G, and out of the opening The front slide-valvc is reached from )5 the open fire-door Q, and is placed between the grate E and fire-door Q, and is employed to admit of the removal of clinkers, ashes, or coal from the grate, and also to admit oxygen when desired at that portion of the furnace, through a slot made by the withdrawal of the valve I; or the overlap of the valve may be provided with a series of openings for that purpose; The slide-valve J provides for a direct draught to, the chimney, and the movement of the valve for that purpose clears the flue H of any ashes by dropping the same into flue G. The cor-' rugated tubularchamb er, flanged upon its interior, and having an incombustible termination, more completely prepares the oxygen admitted thereto, by exposing it to the action of the intense hcatof the upper front flue, and this chamber,with itsl arge internal surface, as the air traverses the numerous tubular channels composing it, and is concentrated for. contact with the heated gases of the fuel. Ari intense combustion of'thogases' is secured at the junction of the upper front flue and the chamber of combustion. The semi-cylindrical reverberating chamber of combustion, provided as it iswith a non-conducting arch, tends to keep the gass highly heated in their passage through the same,'and comming'les and concentrates them prior to their entrance into the tubcs. This produces a most complete combustion and an increased usefulness in their after passage through the tubes. The admitted heated oxygen, the concentration, the increased temperature arising from the-nonconducting walls, all tend to produce a great economy and utility in a great degree. The bed-plate or gratoplate (see fig. 4) extends the entirelcngth and -width of the chamber of'comhustion and the dues, and is so constructed that it forms-a support not only for the grate and brick-wort: of the combustion-chamber, but also i the bed of the front flue, and carries'with it the slide-valves I and J, but also becomes 'a part of the air-heating chamber and flue, as well as of the ash-pit. The division-platc'or plates 27 (see fig. 6) are provided onboth surfaces with connecting-flanges, recesses, collars, or any other mechanical arrangement. By means of this plate 27 one or more additional congcries of tubes can be attached, thus lengthening the lines as well as dividing J them through that section, thereby adding as much more surface as desired to the action of the heat and the air, radiating the heat at a lower temperature, producing to a greater extent abrcathable, healthy, and pleasant atmosphere, much more suitable for those having weal; lungs than the heated air of ordinary furnaces, where the surfacc'is less, and that surface very highly heated. These plates are also used in connection with crosswalls of brick-work, which form, as it-were, a continuation of the division-plate 27, and serve as a division of the hot-air chambefithereby givingmore perfect control of the heated air, which by this means canbe readily applied to certain parts of buildi'ngsnot readily warmed when connected with a single air-chamber, as at all times the longer and larger distributing-pipes of hot-air furnaces take away, by the strong current, the heated air, producing a back action in the shorter and lesser pipes, thereby taking away entirely or lessening the effectv desired at those points. In the cross-walls of brick-work, valves may be placed to connect the whole chamber desired.

It will be seen that by such a combination I do not depart from mypresent invcntioa, but only increase its. utility and economy. The heatingapparatus which I have just described-is not altered in any respect, the presence of the division-plate or plates and cross-walls of brick or other material serving to place the some more completely under the control of the operator, and allowing the heating air to be received eitherfrom the series of tubes upon one side of the division-plate or plates 2? or from the opposite series of tubes supplied with heating air from the combustion-chamber, in the precise manner described, in which no division-plate or plates was or were used. i

Having thus described my present invention, what I claim as new, and desire to secure by Letters Potent, is-

1. I claim the. combination of the grate E, ash-pit-D, and comhustion-chcmbcr C, with the slide-velve I;

for the purposes indicated.

2. I claim the slide-valve at the junction of the upper and under front flue, for the purposes d scribed.

3; I claim t e upper front flue corerctl externally with a non-conducting lining, as a portion of the combustion-chamber. I

4. I claim the corrugated tubular externally-flanged chamber, provided with an incombustible termination, constructed and operating substantially as shown, for the purposes pointed out. V

v 5. I claim a. semi-cylindrical reverbercting chamber of combustion, when combined with e. flue and a; series of tubes, for the purposes specified. I l

6. I claim a; feeding-chamber in combination with an arched chamherof combustion and the abutments for properly distributing the fuel upon the grate.

7. I claim constructing the bed-plate or grate-plate in such :1. manner that the same shall form a. support for the grate and brick-work of the chamber ofeomhustion, as well as the bed of the front flue.

8. I claim the division-plate, in combination with a series of tubes, for the purposes fully described.

CHAS. 'J; SHEPARD.

Witnesses:

O. 0. GORDON, A; SIDNEY DOANE. 

